[ifmpx]

I'm more interested in knowing how they determine where I am. Do this feature require a GPS-enabled device to activate?

[roryokane]

Firefox already has code to determine your location, since it supports the Geolocation API for JavaScript (https://developer.mozilla.org/en-US/docs/Web/API/Geolocation...). I’m not sure how Firefox implements it, but on a device without a GPS, programs could determine your location from the list of nearby Wi-Fi access points or from your IP address.